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Router can be used to parse urls into arrays containing indexes for the controller, action, and any parameters, and the opposite: to convert url arrays (eg. array(“controller”=>”posts”, “action”=>”index”)) to string urls.
Read more about ways to configure the Router here: https://book.cakephp.org/1.3/fr/The-Manual/Developing-with-CakePHP/Configuration.html#configuration-des-routes
Router also include other utility methods for dealing with urls.